package lwk.thread.lock;

/**
 * @author:lwk
 * @create: 2022-08-08 20:02
 * @Description: 死锁：多个线程互相占用对象需要的资源，然后形成僵持
 */
public class DeadLock {

    public static void main(String[] args) {
        Makeup sz = new Makeup(0, "大傻子");
        Makeup cm = new Makeup(1, "小聪明");

        sz.start();
        cm.start();
    }

}

// 口红
class Lipstick {

}

// 镜子
class Mirror {

}

class Makeup extends Thread {

    // 需要的资源，用static关键字来保证只有一份
    static final Lipstick lipstick = new Lipstick();
    static final Mirror mirror = new Mirror();

    int choice; // 选择
    String girlName; // 使用化妆品的人

    public Makeup (int choice,String girlName) {
        this.choice = choice;
        this.girlName = girlName;
    }

    @Override
    public void run() {
        // 化妆
        try {
            makeup();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }

    // 化妆，互相持有对方的锁，就是需要拿到对方的资源
    private void makeup () throws InterruptedException {
        if (choice==0) {
            synchronized (lipstick) { //获得口红的锁
                System.out.println(this.girlName+"获得口红的锁");
                Thread.sleep(1000);
                synchronized (mirror) { // 一秒钟后想获得镜子
                    System.out.println(this.girlName+"获得镜子的锁");
                }
            }
        } else if (choice==1) {
            synchronized (mirror) { //获得镜子的锁
                System.out.println(this.girlName+"获得镜子的锁");
                Thread.sleep(1000);
                synchronized (lipstick) { // 一秒钟后想获得口红
                    System.out.println(this.girlName+"获得口红的锁");
                }
            }
        }
    }

}